A generalization of Hall's theorem for $k$-uniform $k$-partite hypergraphs

Document Type: Research Paper

Author

Department of Mathematics, Institute for Advanced Studies in Basic Science (IASBS), Zanjan, Iran

Abstract

In this paper we prove a generalized version of Hall's theorem in graphs‎, ‎for hypergraphs‎. ‎More precisely‎, ‎let $\mathcal{H}$ be a $k$-uniform $k$-partite hypergraph with some ordering on parts as $V_{1}‎, ‎V_{2}‎,‎\ldots‎,‎V_{k}$ such that the subhypergraph generated on $\bigcup_{i=1}^{k-1}V_{i}$ has a unique perfect matching‎. ‎In this case‎, ‎we give a necessary and sufficient condition for having a matching of size $t=|V_{1}|$ in $\mathcal{H}$‎. ‎Some relevant results and counterexamples are given as well‎.

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